94 lines
3.4 KiB
PHP
94 lines
3.4 KiB
PHP
<?php
|
|
/*
|
|
* Copyright 2009 ZXing authors
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
namespace Zxing;
|
|
|
|
use Zxing\Common\BitArray;
|
|
use Zxing\Common\BitMatrix;
|
|
|
|
/**
|
|
* This class hierarchy provides a set of methods to convert luminance data to 1 bit data.
|
|
* It allows the algorithm to vary polymorphically, for example allowing a very expensive
|
|
* thresholding technique for servers and a fast one for mobile. It also permits the implementation
|
|
* to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.
|
|
*
|
|
* @author dswitkin@google.com (Daniel Switkin)
|
|
*/
|
|
abstract class Binarizer
|
|
{
|
|
protected function __construct(private $source)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* @return LuminanceSource
|
|
*/
|
|
final public function getLuminanceSource()
|
|
{
|
|
return $this->source;
|
|
}
|
|
|
|
/**
|
|
* Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
|
|
* cached data. Callers should assume this method is expensive and call it as seldom as possible.
|
|
* This method is intended for decoding 1D barcodes and may choose to apply sharpening.
|
|
* For callers which only examine one row of pixels at a time, the same BitArray should be reused
|
|
* and passed in with each call for performance. However it is legal to keep more than one row
|
|
* at a time if needed.
|
|
*
|
|
* @param $y The row to fetch, which must be in [0, bitmap height)
|
|
* @param An $row optional preallocated array. If null or too small, it will be ignored.
|
|
* If used, the Binarizer will call BitArray.clear(). Always use the returned object.
|
|
*
|
|
* @return array The array of bits for this row (true means black).
|
|
* @throws NotFoundException if row can't be binarized
|
|
*/
|
|
abstract public function getBlackRow($y, $row);
|
|
|
|
/**
|
|
* Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
|
|
* and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
|
|
* may not apply sharpening. Therefore, a row from this matrix may not be identical to one
|
|
* fetched using getBlackRow(), so don't mix and match between them.
|
|
*
|
|
* @return BitMatrix The 2D array of bits for the image (true means black).
|
|
* @throws NotFoundException if image can't be binarized to make a matrix
|
|
*/
|
|
abstract public function getBlackMatrix();
|
|
|
|
/**
|
|
* Creates a new object with the same type as this Binarizer implementation, but with pristine
|
|
* state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
|
|
* of 1 bit data. See Effective Java for why we can't use Java's clone() method.
|
|
*
|
|
* @param $source The LuminanceSource this Binarizer will operate on.
|
|
*
|
|
* @return Binarizer A new concrete Binarizer implementation object.
|
|
*/
|
|
abstract public function createBinarizer($source);
|
|
|
|
final public function getWidth()
|
|
{
|
|
return $this->source->getWidth();
|
|
}
|
|
|
|
final public function getHeight()
|
|
{
|
|
return $this->source->getHeight();
|
|
}
|
|
}
|